<?php namespace App\Http\Services;

class ToolsManager
{
    /**
     * 生成订单编号
     * @return string
     */
    public static function makeBillNum(){
        $orderSn = date('Ymdhis',time()). substr(microtime(), 2, 5) . sprintf('%02d', rand(0, 999));
        return $orderSn;
    }
}